Chuck for holding watch-bezels



(No Model.)

S. LSNYDER. Chuck f0r Holding Watch Bezels.

No. 243,467. Patented June 28 18 81.

n. PETERS. HMoLilhognphor. Wnhinglan. tic.

UNITED STATES PATENT OFFICE.

SAMUEL I. SNYDER, OF OLEARFIELD, PENNSYLVANIA.

CHUCK FOR HOLDING WATCH-BEZELS.

SPECIFICATION forming part of Letters Patent No. 243,467, dated June 28,1881.

Application filed April 15, [881.

To all whom "it may concern Be it known that I, SAMUEL I. SNYDER, acitizen of the United States, residing at Clearfield, in the county ofOlearfield and State of Pennsylvania, have invented certain new anduseful Improvements in Chucks for Holding VVatch-Bezels; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters or figures of reference inarked thereon, which form a part of this specification.

In the drawings, Figure l is a front view of my improved chuck forwatch-'lathes. Fig. 2 is a diametrical section on the line a: as ofFig. 1. Fig. 3 is a side elevation of one of the slidin g-dogsdetachedfrom the body of the chuck, and also shows a section of the centralrevolving plate for moving said dogs to and fro longitudinally.

Similar letters of reference in the several drawings denote similarparts.

Those persons whose business or occupation requires the use of smalllathes-as, for instance, jewelers, watch-makers, &c.-have long felt theneed of a simple, durable, and easilyoperated chuck wherewith to firmlyhold such pieces of mechanism as require to bemade or repaired by or inthe lathe.

To accomplish the above end many inventions have been made, but in themajority of cases such inventions have been of such complicated natureas to render them practically useless.

The object, therefore, of the present invention has been to provide asimple, durable, and easily-operated chuck for the use of the craftsmenabove named, which chuck, although more particularly designed forturning the grooves in and rounding the outer edges of wateh-bezels, isyet applicable to many purposes for which a chuck is used; and to thisend it consists in a chuck provided with laterally-movin g dogs havingtheir outer ends turned in an upward direction and provided withshoulders or recesses, beveled to hold the bezel orpther work, ashereinafter set forth and described.

It also consists in means whereby the dogs No model.)

are set correctly and rapidly in the body of the chuck, as hereindescribed; and- It finally consists in the combination of the parts as awhole, and in the means whereby the chuck is secured to the mandrel ofthe lathe, as will be hereinafter set forth and described.

Referring to the drawings, A represents the body of the chuck,consisting of a thin circular disk or plate, of brass or other suitablemetal, provided upon its rear surface with a boss or hub, a.

In the plate A, equidistant from each other and diverging from a commoncenter, are a number (preferably ten) of slots at, having at their upperedges and at each side thereof retaining-shoulders to, within and uponwhich rest and slide thin flat bars 0, provided at their outer ends withupwardly-projecting portions or anvils 0, such bars 0 and anvils Oconstituting the retaining-dogs of the chuck. The outer and inner sidesof the anvils O are in curved form, as shown.

Near the upper surfaces of the anvils O, and at each side thereof, areshoulders or recesses c c, the rear side of each of which is beveled tomore securely hold the desired article. The anvils 0 project outwardlyat each end beyond the sides of the slot at, said projecting portionsresting upon the face of the plate A.

Projecting from the lower surface of the anvils C, and extending throughthe slots at, are studs or pins 0, provided at their outer ends withheads 0 that bear upon .the rear surface of the plate A, thereby keepinganvil O and bar 0 in position in the slot a, as will be readil yunderstood.

I provide the upper surface of the bars 0 with teeth 0 that engage withcorresponding spiral grooves b formed in the lower surface of a circularplate, 13, pivoted to the center of the plate A by a screw, 1). TheplateB is rotated by means of small studs 1), that project from theupper surface thereof, and when so rotated will, inasmuch as the groovel is of spiralform, or is, in fact, one continuous groove, draw the dogsinward or move them outward as the plate B is rotated right or left.

The inward movement of the dogs is limited by an annular ring, D,secured to and project ing above the upper surface of the plate A, asshown. This ring Ideem of importance, inas much as it is only necessary,in order to correct the chuck at any time, to remove the plate B, pushthe dogs into their proper slots and backward until their rear ends bearagainst the ring D, and replace the plate 13, when the anvils C will beequidistant from the center of the plate.

The boss or hub a. of the plate A is provided with a slightly-conicalrecess, a, and at one side, near the outer end of said recess, is asmall nick or recess, a which fits upon a pin or stud in the mandrel ofthe lathe when the chuck is in place, thus preventing the chuck frombeing rotated upon said mandrel.

The recess a may be provided with a female screw, if desired.

I am aware that chucks have been made the clamping-dogs of which aremoved in lateral direction by a spiral groove acting upon teeth in saiddogs, and this I therefore do not claim, broadly but What I do claim,and desire to secure by Letters Patent, is-

1. In a lathe-chuck, the combination of the plate A, provided with slotsto, having shoulders a, boss or hub to, having the conicalshaped recessa and recess a with the circu lar plate 13, having the spiral groove 12and studs 1), bars O, provided with anvils O, havin g beveledretaining-shoulders c 0 and studs 0, having head 0, substantially asdescribed.

2. In a lathe-chuck, the annular ring D, attached to the upper surfaceof the plate A, about the center thereof, whereby the inward movement ofthe dogs may be limited and whereby the said dogs may be at all timesset in proper position, substantially as described.

3. In a lathe-chuck, the combination of the bars 0, provided with teeth0 anvil 0, having beveled retaining-shoulders c 0 and stud 0, havinghead 0, with an annular ring, D, and circular plate B, provided withspiral grooves b and studs 7), as set forth.

4. In a lath-chuck, the anvils 0, provided with recesses or shoulders c0 having beveled sides, substantially as described.

In testimony whereof I aftix my signature in presence of two'witnesses.

SAML; I. SNYDER.

Witnesses:

J. F. SNYDER, J. F. McKENRIcK.

